Komatsubulldozersmall ( - d39)

Komatsu DWT037_1B_E7(S/N 3001-UP (D31A/AM))

Maintenance schedule, common problems & OEM parts breakdown

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The Komatsu DWT037-1B-E7 is a heavy crawler bulldozer designed for large-scale earthmoving and mining applications. This specific unit, identified by serial number S/N 3001-UP and engine code D31A/AM, is part of the DWT037 series. It is powered by a Komatsu diesel engine and features a torque converter transmission with a multi-disc wet clutch and brake system. The machine is equipped with a heavy-duty undercarriage and a dozer blade configuration suitable for high-production work. Operating weights and specific configurations vary by attachment package and regional emissions standards.

The DWT037 series represents a generation of heavy dozers engineered for durability and high drawbar pull. This model succeeded earlier D37 series variants and was eventually succeeded by newer generations incorporating advanced emissions controls and telematics. In the used and parts market, the DWT037-1B-E7 remains significant due to its robust powertrain and undercarriage design, which are common sources of replacement parts. The D31A/AM engine configuration is a key identifier for parts compatibility, distinguishing it from other DWT037 variants like the D1 or D7 series which may use different engine codes or serial ranges.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.

Komatsu DWT037_1B_E7(S/N 3001-UP (D31A/AM)) specifications

Engine

ModelSA6D170E
Net Power391 kW (525 HP)
EmissionsTier 4 Final / EU Stage V

Weights

Operating Weight66,740 kg (147,160 lb)

Dimensions

Track Shoe Width400 mm
Transport Length11.1 m
Transport Width7.39 m
Transport Height4.88 m

Performance

Travel Speed7.9 mph
GradeabilityNot documented for this exact serial range — verify with your dealer
Ground PressureNot documented for this exact serial range — verify with your dealer

Blades

Blade TypeSemi-U (SU)
Blade Capacity19.9 cu yd

Service Capacities

Fuel CapacityNot documented for this exact serial range — verify with your dealer
Hydraulic CapacityNot documented for this exact serial range — verify with your dealer
Engine Oil CapacityNot documented for this exact serial range — verify with your dealer
Cooling CapacityNot documented for this exact serial range — verify with your dealer

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

Komatsu DWT037_1B_E7(S/N 3001-UP (D31A/AM)) maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level and condition.
  • Check hydraulic fluid level via sight glass.
  • Check coolant level and ensure cap is secure.
  • Drain water from fuel separator.
  • Check DEF level.
  • Check air filter restriction indicator.
  • Inspect track tension and shoe condition.
  • Inspect hydraulic hoses for cracks or leaks.
  • Check for fluid leaks under the machine.
  • Verify ROPS/FOPS integrity and seat belt function.
  • Test horn, backup alarm, and lights.
  • Test brakes and parking brake.
  • Verify KOMTRAX display and gauges are normal.
Every 250 h
  • Change engine oil and filter.
  • Grease all points including blade, ripper, and push arms.
  • Check hydraulic fluid level.
  • Check coolant level.
  • Inspect air filter outer element.
  • Inspect belts and hoses.
  • Check final drive oil level.
  • Visual undercarriage inspection.
Every 500 h
  • Replace fuel filter.
  • Replace hydraulic return filter.
  • Perform KOWA oil sample.
  • Test battery and alternator.
  • Test coolant SCA.
  • Check final drive oil level.
  • Visual undercarriage inspection.
Every 1,000 h
  • Change engine oil and filter.
  • Replace air filter outer element.
  • Replace hydraulic return filter.
  • Change final drive oil.
  • Inspect turbocharger.
  • Check swing machinery oil.
  • Measure undercarriage wear.
  • Inspect structural welds.
Every 2,000 h
  • Change engine oil and filter.
  • Flush and replace coolant.
  • Change hydraulic oil.
  • Change transmission/torque converter oil.
  • Replace fuel filter.
  • Replace air filter outer element.
  • Comprehensive undercarriage inspection.
  • Torque ROPS bolts.
  • Torque cutting edge and end bit bolts.

Servicing the DWT037_1B_E7(S/N 3001-UP (D31A/AM)) beyond the schedule

Predictive Maintenance & Fluid Analysis

Utilize Komatsu Oil Wear Analysis (KOWA) at every 500-hour interval to monitor engine oil, hydraulic fluid, and coolant for wear metals and contaminants. Track hydraulic particle count and viscosity to predict pump and valve health. Monitor coolant SCA concentration to prevent liner cavitation and corrosion. Use KOMTRAX telematics to track fuel consumption trends and fault codes, allowing for proactive intervention before component failure occurs during high-load operations.

Corrective & Common Repairs

Address frequent undercarriage wear by regularly measuring track link elongation and sprocket tooth profile. Replace hydraulic return filters at 500-hour intervals to prevent contamination of sensitive valve components. Inspect and torque cutting edge and end bit bolts to prevent structural damage to the blade frame. Check final drive oil for water ingress or metal shavings, indicating gear or bearing failure. Maintain proper track tension to reduce roller and idler wear.

Overhaul & Rebuild Points

Plan major powertrain overhauls based on hydraulic oil condition and engine oil analysis results. Replace hydraulic oil at 2,000-hour intervals or earlier if analysis indicates degradation. Inspect turbocharger blades and housing for wear during the 1,000-hour service. Evaluate transmission clutch packs and torque converter components for slippage or overheating signs. Perform comprehensive structural inspections of the main frame and swing circle welds to identify fatigue cracks before they propagate.

Seasonal & Environment Servicing

In cold climates, ensure coolant concentration is adequate to prevent freezing and check DEF fluid levels to avoid system lockout. In dusty environments, inspect the air filter restriction indicator more frequently and clean radiator and oil cooler fins daily to prevent overheating. In wet conditions, check final drive and swing machinery seals for water intrusion. Adjust track tension to prevent slippage on muddy or loose terrain, and inspect undercarriage components for accelerated wear from abrasive materials.

DWT037_1B_E7(S/N 3001-UP (D31A/AM)) common service parts

Part numberPart
07000-02080O-Ring,Hydraulic Oil FilterCheck fitment →
195-13-13420FilterCheck fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

DWT037_1B_E7(S/N 3001-UP (D31A/AM)) fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
CA115Engine crankshaft speed sensor failureBroken sensor, wiring issue, or connector corrosionReplace the speed sensor and verify voltage at the pin connector
CA111Internal engine controller faultECM internal abnormalityReplace or reprogram the ECM
CA441Battery voltage too lowAlternator or battery failureReplace the alternator or battery and check the voltage regulator
CA442Battery voltage too highAlternator or battery failureReplace the alternator or battery and check the voltage regulator
AA10NXAir cleaner cloggingDirty or blocked air filterReplace the air filter
CA122Intake air pressure high voltageSensor malfunction or actual overpressureVerify the intake pressure sensor and wiring
CA123Intake air pressure low voltageSensor short or airflow restrictionCheck for a sensor short or an airflow restriction
CA153Intake air temperature sensor error (high)Sensor failureReplace or test the IAT sensor
CA154Intake air temperature sensor error (low)Sensor failureReplace or test the IAT sensor
CA451Common rail pressure sensor feedback value too highMalfunction in the rail sensor or actual overpressure conditionDiagnose the fuel rail pressure sensor or pump lines

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

DWT037_1B_E7(S/N 3001-UP (D31A/AM)) attachments & work tools

Blades

The DWT037-1B-E7 (S/N 3001-UP, D31A/AM) is a Japanese-market bulldozer; specific blade types (S/SU/A/VPAT), widths, and capacities are not documented in the provided source text, which only lists 'WORK EQUIPMENT' as a manual section without technical values.

Rippers

The provided source text does not contain specifications for multi-shank or single-shank ripper options, weights, or availability for the DWT037-1B-E7 (S/N 3001-UP, D31A/AM) series.

Winches

The provided source text does not contain specifications for winch class, towing capacity, or hydraulic winch options for the DWT037-1B-E7 (S/N 3001-UP, D31A/AM) series.

Drawbars/Counterweights

The provided source text does not contain specifications for drawbar configurations or counterweight options for the DWT037-1B-E7 (S/N 3001-UP, D31A/AM) series.

Cab/ROPS Guarding

The provided source text does not contain specifications for forestry or waste configuration guarding options for the DWT037-1B-E7 (S/N 3001-UP, D31A/AM) series.

Hydraulic Arrangement

The provided source text does not contain specifications for front or rear tool hydraulic arrangements for the DWT037-1B-E7 (S/N 3001-UP, D31A/AM) series.

All DWT037_1B_E7(S/N 3001-UP (D31A/AM)) assemblies by section

Every catalogued assembly group for the Komatsu DWT037_1B_E7(S/N 3001-UP (D31A/AM)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Work Equipment
Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Fair Lead (For Towing Winch)
01***25Bolt,(Without Rops Guard? Canopy)8
01***40Bolt,(With Center Guard)4
01***40Stud4
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Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Logging Arm (For Towing Winch)
01***25Bolt,(Without Rops Guard? Canopy)6
01***30Bolt,(Not Used With Emergency Str.)2
01***40Bolt,(With Center Guard)8
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Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Bevel Gear? Drum And Wire Rope)
01***30Bolt,(Not Used With Emergency Str.)2
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps12
01***35Bolt,R.H. Outside And L.H. Inside12
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Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Bevel Pinion And Shift Fork)
01***30Bolt,(For Mechanical Governor)1
01***22Bolt8
01***30Bolt,(For Quick Shift) (Mitsubishi)2
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Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Control Valve)
01***25Bolt,Without Revolution Sensor2
01***55Bolt,(10m)3
01***60Bolt,(For Japan And Sweden)3
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Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Mission Case)
01***25Bolt,Without Revolution Sensor3
01***35Bolt,(For Position Fixing)2
01***70Bolt (Op)4
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Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Winch Case)
01***20Bolt,(With Auto Emergency Steering)4
01***30Bolt,(Not Used With Emergency Str.)30
01***40Bolt,(With Service Valve R.H.)2
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Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Winch Pump)
01***55Bolt,(10m)5
01***70Bolt (Op)2
01***06Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-108061
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Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Winding Clutch) (1/2)
01***30Bolt,(For Mechanical Governor)3
01***30Bolt,(For Quick Shift) (Mitsubishi)2
01***25Washer,Spring?For Additional Rear Lam3
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Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch (Winding Clutch) (2/2)
01***20Bolt,(With Auto Emergency Steering)6
01***35Bolt, Bolt, Mount Tubes To Switch And Work Pumps3
01***70Bolt1
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Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch Control Lever
01***20Bolt,(With Auto Emergency Steering)4
01***25Bolt,Without Revolution Sensor2
01***30Bolt,(For Mechanical Governor)4
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Komatsu : Dwt037_1b_e7(S/N 3001-Up (D31a/Am)) : Work Equipment : Towing Winch Control Linkage
01***20Bolt,(With Auto Emergency Steering)2
01***30Bolt,(For Mechanical Governor)2
01***16Bolt, Battery To Frame Ground Wire Attaching3
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DWT037_1B_E7(S/N 3001-UP (D31A/AM)) serial number reference

The PIN plate for Komatsu bulldozers is typically located on the front frame casting, usually on the operator's left side near the radiator support. On larger dozers, it may also appear on the inside of the cab door pillar. Read the prefix as the alphanumeric code at the start of the model designation (e.g., DWT037_1B_E7) followed by the serial number range (S/N 3001-UP) and the engine code in parentheses (D31A/AM).

PrefixIdentifies
DWT037_1B_E7DWT037_1B_E7

Frequently asked questions

What engine does the Komatsu DWT037-1B-E7 (S/N 3001-UP) use?

The Komatsu DWT037-1B-E7 with serial number S/N 3001-UP is equipped with the D31A/AM engine.

What is the operating weight of the Komatsu DWT037-1B-E7?

Operating weight varies by configuration and attachment package. Specific weight data for this exact serial range is not provided in the general specifications; consult the machine's data plate or dealer for precise weight based on installed options.

What model replaced the Komatsu DWT037 series?

The DWT037 series was succeeded by newer generations of Komatsu heavy bulldozers incorporating updated emissions standards and telematics. Specific successor model numbers vary by region and production year.

What DWT037_1B_E7(S/N 3001-UP (D31A/AM)) owners discuss

What engine powers the Komatsu DWT037-1B-E7 (S/N 3001-UP)?
The Komatsu DWT037-1B-E7 (S/N 3001-UP) is equipped with the D31A engine. This designation is specific to serial number range 3001-UP for this model variant. Other variants in the DWT037-1B series, such as those with serial numbers starting with 42, 45, or 41, utilize different engine configurations (e.g., D31E, D31P, D31S). The D31A engine is a key identifier for this specific generation and serial block. Factory specifications for the D31A engine should be consulted for exact displacement and power ratings, as these are not detailed in the provided parts catalog or general spec directories for this specific serial range. The engine is part of the Komatsu D31A/AM series configuration.
What are common hydraulic behaviors and failure modes for this machine type?
Hydraulic performance issues often manifest as slow operation when the system is hot, indicating internal leakage in pumps, control valves, or cylinders that becomes more pronounced as oil viscosity drops. Shared hydraulic weakness across all functions suggests a common cause such as low oil level, incorrect oil specification, clogged filters, or engine speed issues rather than a single component failure. One-function slowness points to circuit-specific issues like cylinder leakage, control valve spool problems, or pilot control input faults. Hydraulic oil overheating is a critical concern, often linked to cooler blockage or internal pump wear. Komatsu Care maintenance programs specify regular hydraulic oil and system servicing to mitigate these risks. Using the correct Komatsu hydraulic oil specification is essential for proper system function and component longevity.
What undercarriage and wear patterns are typical for this bulldozer?
Undercarriage wear is a significant factor in operational costs. Track tension must be regularly checked and adjusted to prevent premature wear on rollers, idlers, and track chains. Mud or debris packed into the undercarriage can cause binding and uneven wear. Track pads, bushings, and bearings are subject to significant wear and tear, leading to noise, vibration, and potential track failure if not monitored. Worn bushings can cause excessive play and accelerated wear on other undercarriage components. Regular inspection of track condition, roller condition, and track tension is vital. Proper lubrication of undercarriage components helps reduce friction and extend service life. The undercarriage condition is a key indicator of the machine's overall health and remaining value.
What are common electrical and sensor issues reported for Komatsu machines of this era?
Komatsu machines of this generation rely heavily on electronic control systems, making them susceptible to issues from faulty sensors or unstable power supplies. Common electrical problems include intermittent starting, dashboard display failures, and random machine shutdowns. Sensor malfunctions can trigger multiple warning signals and affect engine performance and hydraulic control. Specific error codes related to sensors include those for coolant temperature, intake air temperature, charge air pressure, fuel temperature, and rail pressure. Issues with the mass air flow sensor, throttle position sensor, and various pressure sensors can lead to derating or poor performance. Battery condition and charging system health are also critical, as low voltage can cause erratic behavior in electronic components. Grounding issues can also contribute to electrical faults.
What engine quirks or maintenance points are associated with the D31A series?
Engine performance issues such as loss of power, increased fuel consumption, or overheating may indicate airflow restriction, injector wear, or failing fuel delivery components. Air filter condition, fuel filters, and fuel tank venting are critical maintenance points. Overheating can result from a blocked cooling package (radiator, hydraulic oil cooler, charge-air cooler) or low coolant levels. Black smoke from the exhaust can indicate incomplete combustion due to fuel or air issues. The engine requires regular oil changes and filter replacements. Monitoring engine oil pressure and coolant temperature is essential. The D31A engine, like other Komatsu engines, benefits from adhering to strict maintenance intervals for fuel and air systems to ensure optimal performance and longevity. Specific maintenance procedures for the D31A engine should be referenced in the operation and maintenance manual for this range.
What is a critical safety-related fix to check when buying a used DWT037-1B-E7 (S/N 3001-UP)?
When inspecting a used DWT037-1B-E7 (S/N 3001-UP), pay close attention to the steering clutch system, particularly on models with wet clutch configurations. Contaminated steering clutch oil, often due to water ingress, can lead to clutch slippage, overheating, and loss of steering control. Inspect the steering clutch oil for signs of water contamination or discoloration. Check for proper operation of the steering clutches and brakes. Faulty steering clutches can cause the machine to pull to one side or fail to steer effectively, which is a critical safety hazard. Have your dealer verify the condition of the steering clutches and the integrity of the steering system seals and cooling circuits before purchase. Steering system failure can lead to loss of machine control and potential accidents.
What are the key fluid specifications for this machine?
The Komatsu DWT037-1B-E7 (S/N 3001-UP) requires specific fluids for optimal performance. Hydraulic system fluid should be Komatsu EO or equivalent high-quality hydraulic oil meeting Komatsu specifications. Engine oil should be Komatsu TO or equivalent diesel engine oil suitable for the operating conditions and engine type (D31A). Cooling system fluid should be Komatsu ELC or equivalent extended-life coolant. Transmission and final drive fluids should be Komatsu AXO or equivalent gear oil. Using the correct fluid specifications is critical for component longevity and system performance. Refer to the operation and maintenance manual for this range for exact capacities and specifications, as they can vary by configuration and operating environment.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

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